312 lines
8.0 KiB
C
312 lines
8.0 KiB
C
/* Copyright (C) 2003-2013 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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/* Kernel module implementing an IP set type: the bitmap:port type */
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#include <linux/module.h>
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#include <linux/ip.h>
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#include <linux/skbuff.h>
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#include <linux/errno.h>
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#include <linux/netlink.h>
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#include <linux/jiffies.h>
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#include <linux/timer.h>
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#include <net/netlink.h>
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#include <linux/netfilter/ipset/ip_set.h>
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#include <linux/netfilter/ipset/ip_set_bitmap.h>
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#include <linux/netfilter/ipset/ip_set_getport.h>
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#define IPSET_TYPE_REV_MIN 0
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/* 1 Counter support added */
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#define IPSET_TYPE_REV_MAX 2 /* Comment support added */
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>");
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IP_SET_MODULE_DESC("bitmap:port", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX);
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MODULE_ALIAS("ip_set_bitmap:port");
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#define MTYPE bitmap_port
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/* Type structure */
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struct bitmap_port {
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void *members; /* the set members */
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void *extensions; /* data extensions */
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u16 first_port; /* host byte order, included in range */
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u16 last_port; /* host byte order, included in range */
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u32 elements; /* number of max elements in the set */
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size_t memsize; /* members size */
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struct timer_list gc; /* garbage collection */
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};
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/* ADT structure for generic function args */
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struct bitmap_port_adt_elem {
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u16 id;
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};
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static inline u16
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port_to_id(const struct bitmap_port *m, u16 port)
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{
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return port - m->first_port;
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}
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/* Common functions */
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static inline int
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bitmap_port_do_test(const struct bitmap_port_adt_elem *e,
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const struct bitmap_port *map, size_t dsize)
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{
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return !!test_bit(e->id, map->members);
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}
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static inline int
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bitmap_port_gc_test(u16 id, const struct bitmap_port *map, size_t dsize)
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{
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return !!test_bit(id, map->members);
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}
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static inline int
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bitmap_port_do_add(const struct bitmap_port_adt_elem *e,
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struct bitmap_port *map, u32 flags, size_t dsize)
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{
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return !!test_and_set_bit(e->id, map->members);
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}
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static inline int
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bitmap_port_do_del(const struct bitmap_port_adt_elem *e,
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struct bitmap_port *map)
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{
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return !test_and_clear_bit(e->id, map->members);
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}
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static inline int
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bitmap_port_do_list(struct sk_buff *skb, const struct bitmap_port *map, u32 id,
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size_t dsize)
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{
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return nla_put_net16(skb, IPSET_ATTR_PORT,
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htons(map->first_port + id));
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}
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static inline int
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bitmap_port_do_head(struct sk_buff *skb, const struct bitmap_port *map)
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{
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return nla_put_net16(skb, IPSET_ATTR_PORT, htons(map->first_port)) ||
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nla_put_net16(skb, IPSET_ATTR_PORT_TO, htons(map->last_port));
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}
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static int
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bitmap_port_kadt(struct ip_set *set, const struct sk_buff *skb,
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const struct xt_action_param *par,
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enum ipset_adt adt, struct ip_set_adt_opt *opt)
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{
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struct bitmap_port *map = set->data;
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ipset_adtfn adtfn = set->variant->adt[adt];
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struct bitmap_port_adt_elem e = {};
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struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
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__be16 __port;
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u16 port = 0;
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if (!ip_set_get_ip_port(skb, opt->family,
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opt->flags & IPSET_DIM_ONE_SRC, &__port))
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return -EINVAL;
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port = ntohs(__port);
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if (port < map->first_port || port > map->last_port)
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return -IPSET_ERR_BITMAP_RANGE;
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e.id = port_to_id(map, port);
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return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
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}
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static int
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bitmap_port_uadt(struct ip_set *set, struct nlattr *tb[],
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enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
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{
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struct bitmap_port *map = set->data;
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ipset_adtfn adtfn = set->variant->adt[adt];
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struct bitmap_port_adt_elem e = {};
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struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
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u32 port; /* wraparound */
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u16 port_to;
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int ret = 0;
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if (unlikely(!ip_set_attr_netorder(tb, IPSET_ATTR_PORT) ||
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!ip_set_optattr_netorder(tb, IPSET_ATTR_PORT_TO) ||
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!ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
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!ip_set_optattr_netorder(tb, IPSET_ATTR_PACKETS) ||
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!ip_set_optattr_netorder(tb, IPSET_ATTR_BYTES)))
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return -IPSET_ERR_PROTOCOL;
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if (tb[IPSET_ATTR_LINENO])
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*lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
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port = ip_set_get_h16(tb[IPSET_ATTR_PORT]);
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if (port < map->first_port || port > map->last_port)
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return -IPSET_ERR_BITMAP_RANGE;
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ret = ip_set_get_extensions(set, tb, &ext);
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if (ret)
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return ret;
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if (adt == IPSET_TEST) {
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e.id = port_to_id(map, port);
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return adtfn(set, &e, &ext, &ext, flags);
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}
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if (tb[IPSET_ATTR_PORT_TO]) {
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port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]);
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if (port > port_to) {
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swap(port, port_to);
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if (port < map->first_port)
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return -IPSET_ERR_BITMAP_RANGE;
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}
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} else
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port_to = port;
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if (port_to > map->last_port)
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return -IPSET_ERR_BITMAP_RANGE;
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for (; port <= port_to; port++) {
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e.id = port_to_id(map, port);
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ret = adtfn(set, &e, &ext, &ext, flags);
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if (ret && !ip_set_eexist(ret, flags))
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return ret;
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else
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ret = 0;
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}
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return ret;
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}
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static bool
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bitmap_port_same_set(const struct ip_set *a, const struct ip_set *b)
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{
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const struct bitmap_port *x = a->data;
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const struct bitmap_port *y = b->data;
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return x->first_port == y->first_port &&
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x->last_port == y->last_port &&
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a->timeout == b->timeout &&
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a->extensions == b->extensions;
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}
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/* Plain variant */
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struct bitmap_port_elem {
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};
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#include "ip_set_bitmap_gen.h"
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/* Create bitmap:ip type of sets */
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static bool
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init_map_port(struct ip_set *set, struct bitmap_port *map,
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u16 first_port, u16 last_port)
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{
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map->members = ip_set_alloc(map->memsize);
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if (!map->members)
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return false;
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if (set->dsize) {
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map->extensions = ip_set_alloc(set->dsize * map->elements);
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if (!map->extensions) {
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kfree(map->members);
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return false;
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}
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}
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map->first_port = first_port;
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map->last_port = last_port;
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set->timeout = IPSET_NO_TIMEOUT;
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set->data = map;
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set->family = NFPROTO_UNSPEC;
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return true;
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}
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static int
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bitmap_port_create(struct net *net, struct ip_set *set, struct nlattr *tb[],
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u32 flags)
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{
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struct bitmap_port *map;
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u16 first_port, last_port;
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if (unlikely(!ip_set_attr_netorder(tb, IPSET_ATTR_PORT) ||
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!ip_set_attr_netorder(tb, IPSET_ATTR_PORT_TO) ||
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!ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
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!ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS)))
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return -IPSET_ERR_PROTOCOL;
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first_port = ip_set_get_h16(tb[IPSET_ATTR_PORT]);
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last_port = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]);
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if (first_port > last_port) {
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u16 tmp = first_port;
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first_port = last_port;
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last_port = tmp;
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}
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map = kzalloc(sizeof(*map), GFP_KERNEL);
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if (!map)
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return -ENOMEM;
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map->elements = last_port - first_port + 1;
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map->memsize = bitmap_bytes(0, map->elements);
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set->variant = &bitmap_port;
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set->dsize = ip_set_elem_len(set, tb, 0);
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if (!init_map_port(set, map, first_port, last_port)) {
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kfree(map);
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return -ENOMEM;
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}
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if (tb[IPSET_ATTR_TIMEOUT]) {
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set->timeout = ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]);
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bitmap_port_gc_init(set, bitmap_port_gc);
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}
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return 0;
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}
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static struct ip_set_type bitmap_port_type = {
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.name = "bitmap:port",
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.protocol = IPSET_PROTOCOL,
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.features = IPSET_TYPE_PORT,
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.dimension = IPSET_DIM_ONE,
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.family = NFPROTO_UNSPEC,
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.revision_min = IPSET_TYPE_REV_MIN,
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.revision_max = IPSET_TYPE_REV_MAX,
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.create = bitmap_port_create,
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.create_policy = {
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[IPSET_ATTR_PORT] = { .type = NLA_U16 },
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[IPSET_ATTR_PORT_TO] = { .type = NLA_U16 },
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[IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
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[IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
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},
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.adt_policy = {
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[IPSET_ATTR_PORT] = { .type = NLA_U16 },
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[IPSET_ATTR_PORT_TO] = { .type = NLA_U16 },
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[IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
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[IPSET_ATTR_LINENO] = { .type = NLA_U32 },
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[IPSET_ATTR_BYTES] = { .type = NLA_U64 },
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[IPSET_ATTR_PACKETS] = { .type = NLA_U64 },
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[IPSET_ATTR_COMMENT] = { .type = NLA_NUL_STRING },
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},
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.me = THIS_MODULE,
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};
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static int __init
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bitmap_port_init(void)
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{
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return ip_set_type_register(&bitmap_port_type);
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}
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static void __exit
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bitmap_port_fini(void)
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{
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ip_set_type_unregister(&bitmap_port_type);
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}
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module_init(bitmap_port_init);
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module_exit(bitmap_port_fini);
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